List of Standard Redox Potentials :
http://infinity.usanethosting.com/Tuition/Stand…
Standard cell potential = standard reduction potential at
cathode + standard oxidation potential at anode. If the cell
potential is positive, redox reaction is feasible, current will
flow (for galvanic/voltaic cells).
Note that :
Standard Reduction potential for Fe3+ to Fe2+ is + 0.77V
Standard Oxidation potential for 2Cl- to Cl2 is – 1.36V
Case 1
Standard Reduction potential for Mn3+ to Mn2+ is + 1.49V
Standard Reduction potential for SO4 2- to
SO2 is + 0.17V
Standard Oxidation potential for 2SO4 2- to S2O8
2- is – 2.01V
Conclusion :
Under standard conditions, Redox reaction between Mn3+ and Cl- (to
produce Mn2+ and Cl2) is feasible.
Case 2
Standard Reduction potential for Cu+ to Cu is + 0.52V
Standard Oxidation potential for Cu+ to Cu2+ is – 0.15V
Standard Oxidation potential for 2I- to I2 is – 0.54V
Conclusion :
Under standard conditions, Redox reaction between Fe3+ and both Cu+
and I- (to produce Fe2+, Cu2+ and I2) is feasible.
(Note : there are of course other species to consider as
additional possible redox reactions, but unless the exam question
specifies the redox potentials for such, otherwise based on the
Data Booklet given in the exams, the above are the only directly
relevant considerations).